Denethor, Stone Seer can give himself up to Bolt something while also making any player the monarch
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Equip only as a sorcery.) Artifact - Equipment Protection (CTRL to add secondary) Pump Akroma, Vision of Ixidor Flying, first strike, vigilance, trample At the beginning of each combat, until end of turn, each other creature you control gets +1/+1 if it has flying, +1/+1 if it has first strike, and so on for double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, protection, reach, trample, vigilance, and partner
This would invalidate all of them and require modifications from the stock list or special rulings done to allow for them if no changes are made
Most importantly, however, is that if the equipped guy deals damage via attack to a player, they discard a card and you untap all lands you control